Liquid-level gauge



Patented Api'. 5, 1927.

ALEXANDER K. SCHAA?, JR., 0F BROGKLYN, NEW YORK, ASSIGNQR TQ THE SCHAAP- r PATENT trice..

BUE/ANT CONTROL CORPORATON, OF NEW YDRK, N. Y., A CRBDRATION OF TEW YORK.

LQUEDGLEVEL GAUGE.

riginal application filed February 21; i923, Serial N6. 620,430. Divided and this application tiled March. I

im. i995, Serll'lo. 19,475.

This invention relates to indicators, and more particularly to an indicating device operating upon the hydrostatic principle tor indicating the liquid coulent of a tank,

or otherreceptacle.

This :1P lioation is a? division oflanfp" plication erial Number 620,43Q,'liled Feb-l ruary 21st, 1923.

' One of the objects of the invention is toi provide in an` indicator of' the above character new andimproved means for rectify-f ,ingl the gauge.d i

Another object ot the invention i3 to provide an indicating-system in co-relation with the suction system usuelly`v employed for withdrawing fuel or, othei` liquid from a supply tank, wherein theairutilized in the rectify'ingoperation' 1`s entrained in a portion of the withdrawn'liquid,located in the suction system during the suction operation, iii/hereby when a portion of the. liquid containing the entrainecl air-is discharged into` 4the body of liquid in the supply tank, the liberated"entraineit air will 'cooperate with the gauge system to rectify the gauge.

v Other' objects and aims 'of the invention,

more or lees specific than Athose vreferred to, above, will he in part obvious and in part" pointed-out in the course ofthe following description of the elements, combinations, :arrangements ot parte and applications of principles, constituting the inventlon, and the scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawing, the figure illustrates schematically a preferred form of embodiment of my invention.

Referring now4 to the drawing, the reference character A denotes a liquid fuel supply tank', B the usual vacuum tank, and C the gauge. In practice, in a liquid fuel supply system of the vacuum. type, the liquid fuel tank is usually located underthe 'bo-dy ot the car behind the rear axle; the 4vacuum tank B at a point under the hood of the automobile above the carburetor, and the gauge C is preferably located on the dash inaposition to be observed by tho occupant ot the drivers compartment of the vehicle.

The function of the vacuum tank B is to draw liquid fuel' through the suction conf duit 1 from the supply tank, mechanisi-n- Renewed February 245, 192?.

The liquid fuel supply tank 'A is pref# erably provided with a vent 2 of any suit able type, so as toperinit eir freely to enter the space, 3 above the liquid fuel 4 in the supply tank. l The conduit 1 entende` downwardly through the top Wall of the liquid ifuel sup ply tank A and has its open end 5 locatedT in proximity to 'thebottom Wall of the tank. In the present instance this conduit 1 en` tends through a larger conduit 6, which con-- duit 6 al'ro extends downwardly into the tank and has its lower open end 7 terminating adjacentI the bottom Well of the'tank, as shown herein, slightly below the lower open end 5 of the conduit 1.

Leading from the air space 3 above the level otl the liquid fuel vin v"che supply tank A- is a tube 8, said tube in the present instance extending through the wall of the conduit 6 and communicating with the con- A duit 1. This tube has u restricted cross sectionalurea as compared withthe cross' see-V tional area of the conduit 1, the construct-ionrbein such that when the vacuum tank B functi ns to draw' liquid fuel from the supply tank A sufficient suction will be proY duced on the tube 8 to cause air toghe drawn into 'the feed line during the suction How whereby said air will be entrained in the liquid 'fuel iiowing upwardly through the suction Conduit 1. tioned trip mechanism in the vacuum tank operates to cut oil or arrest the suction ,dow of the liquid fuel through the conduit 1` the liquid fuel remaining in the conduit 1 is permitted to flow by gravit-y into the liquid supply tank and this recessional flow will induce a slight additional quantity of air through tube 8, which air coinniingling with the air already taken in on the suction 'lwu the above men buoyancy rises and is received 4in the conduit 6. At this' point it `will he noted that onlysuch quantity ot' air will be received in the conduit 6 as is required to establish'v or maintain the 'hydrostatic balance between lhe body of liquid, in the supply tank Aand the in icating medium in the gauge C. 'lhus the 'unige will be rectified upon the occasion el each lre'cessional flow of liquid zt'uei through the conduit l into the body of liquid remaining-in the'supply tank. I

The gauge C in the present instance takes the torni of a Ushaped tube 9, one leg of which is vconnected with the pressure conduit l'leading from the conduit 6. l rIhis U- shapcd tube contains a liquid indicating inedium l2, the rising or falling of which in the leg 13 of said U-shaped tube in combination with a suitable scale (not shown) 'provides the desired indication ot the quantity of fuel remaining in or withdrawn from the supply tank A.. A

lt'will accordingly be seen that the cou- 'struction above set forth attains, among others, all the ends and objects above pointed out in a very simple yet eicient manner.

lt will be noted that the suction system and the gauge system while independent instrumentalities are so correlated that the operation of the suction system rect/ities the gauge and that the withdrawal of the liquid fuel `through the conduit l by the operation of the suction system will not in any wise disturb the hydrostatic balance thereby causing a vibration or momentary fluctuation of the indicating medium in the gauge. y

As many changes could be made in this construction without departing from the scope of the following claims, itis intended that all matter contained in the above description or shown in the accompanying drawings' shall be regarded as illustrative only andnot in a limiting sense.

lflalvng thus described my invention vwhat l claim as'new and desire to secure by Let- ?atent is:

lin apparatus of ,the class described,.in'

posed near the bottom of the'tank, a suction tubel extending down into the liquid in the tank and terminating in an open lower end adjacent thel bottom of the tank and adjoining the open lower end of thcvpressure tube, .means for establishing restricted communication between the suction tube and the air, means for causing a low of liquid from the tank and for permitting a return iiow into the tank through said 'suction tube'so that air will be drawn intov said suction tube through said restricted communicating inezins ou iiow ot the 'liquid therethrough in both directions and be thereby entrained in the liquid in the suction tube and then be discharged from the lower end thereof when liquid returns to the tank through said suction tube, the open lower ends of the suction and pressure tubes being so related that upon such discharge from the suction tube the air thereby released will rise into the pressure tube and fessure actuated means connected with sai ressure tube for indieating the liquid in t e tank.

2. In a device of theclass described, a liquid containing tank, a pressuretube entered through the top of the tank into the liquid therein, a liquid withdrawing tube extending down through the pressure tube into the liquid in the tank, an air inlet tube of restricted size extending through the side ot' `will be released at the lower end of the same,

the pressure tube hav-ing an oulen lower end surrounding the lower end o t. e liquid tube to thereby receive the air thus released from the liquid tube and a pressure gaugg in coiny munication with said rassure tu In testimony whei'eo ,I ax my signature.

r 1| sa a. so, as. 

